|Dynamic Pelvis Phantom.|
The phantom body represents an average human pelvis in shape, proportion and composition. A water-equivalent cube containing a prostate gland and/or various detectors is inserted into the pelvic cavity of the phantom. The cube is connected to a motion actuator box that induces two-dimensional target motion through rotation of the water-equivalent cube. Motion of the cube itself is radiographically invisible due to its matching density with the surrounding material. The prostate and its motion, given its density difference, can be resolved.
Prostate motion is independently controlled with CIRS Motion Control Software. The graphical user interface provides an unlimited variety of optimized motion profiles while simplifying the operation of the Dynamic Pelvis Phantom to an intuitive level. Patient specific profiles are easily imported and there is no need to make hardware adjustments or have special programming skills.
The Dynamic Pelvis Phantom offers ease of use and portability as well as a flexible selection of motion profiles and dosimeter options. All components are packaged in a protective case. The system requires minimal set-up and can be ready to use in minutes. The CIRS Model 008P Dynamic Pelvis Phantom presents a sophisticated solution for the complex challenges and emerging technologies in Image-Guided Radiation Therapy.
USER FRIENDLY MOTION CONTROL...
The Dynamic Pelvis Phantom is operated using CIRS Motion Control Software, a user-friendly graphical user interface that can be used to operate both the Dynamic Prostate Phantom and the Dynamic Thorax Phantom. Upon installation, the user selects the phantom that is to be controlled through a drop down menu on the main screen.
Amplitude, cycle time and phase shift can be applied using slider bars or by entering desired values within the limits of the system. Five different built-in waveforms are available from a standard pull down menu and represent typical prostate motion profiles.
An unlimited number of clinically relevant and user-generated waveforms or correlation models can be imported from tab delimited or comma separated file formats.
There are also waveform editing, smoothing and analyzing tools to ease the optimization of custom waveforms.
The software provides a convenient, real-time graphic display with relevant information about the waveform selected for each direction of simulated tumor. In addition the ROI analyzing function provides the time spent by the target between two chosen amplitudes and the average time weighted position for that particular ROI.
Users can instantly start, stop or pause the motion at any time. New start positions can be graphically selected and applied making the device very useful for static test as well as dynamic testing. Users can also select the number of cycles to be looped by entering the desired value or choose continuous looping (1 million cycles).
|True 2D Target Motion In a Solid Epoxy Phantom...
A water-equivalent homogeneous cube containing a prostate and/or dosimeter is moved within the pelvic region of the solid phantom body. Motion of the cube is radiographically invisible due to its matching density with the surrounding material, however the prostate can be resolved given its density difference.
The cube is inserted in a cylinder so that the prostate's isocenter is offset from the center of the encapsulating cylinder, which has on its cylindrical face, a circular gear (pinion) which engages with teeth on a linear gear rod (rack). Complex 2D motions can be achieved thru the rack and pinion system. The actuator box induces linear motion on the linear gear rod. The linear motion of the rack is thereby converted to rotational motion of the cube.
Complex 2D motion profiles can be achieved thru simultaneous, independently controlled translation in inferior-superior and anterior posterior directions.
There are five (5) prostate motion specific built-in waveforms each with its own default cycle time.
Proven Tissue-Equivalent Phantom Technology...
The phantom body approximates the average human pelvis in both size and structure using simplified geometries. It is constructed of pro prietary tissue equivalent epoxy materials. Linear attenuation's of the simulated tissues are within 1% of actual attenuation for water and bone.
|As internal landmarks, the phantom contains a 3D anthropomorphic pelvis with cortical and trabecular bone. External
alignment marks with embedded fiducials facilitate rapid orientation with positioning lasers and phantom image
Interchangeable Cubes for QA & Dosimetry...
There are eight water-equivalent interchangeable 6.35 cm cubes available for use with the phantom. The cubes accommodate either micro chamber, film or gel dosimeters. All cubes can be quickly interchanged.
For the purpose of evaluating the 3D dose, the pelvis body accomodates model 002GC which receives a standard B9 dose gel container. The container is made from oxygen resistant plastic. Clear walls enable visual inspection of the irradiated gel. The container can be scanned in CT, MRI and optical laser scanners.
The film stack cubic insert accommodates 13 radiochromic films with 4 mm spacing for quasi-3D dosimetry. The cube features groves that enable easy orientation of film scans in the TPS.
The imaging cubes are designed to include solid known volume targets for imaging applications and include either a 25 cc or 50 cc prostate gland.
The micro chamber cubes are designed for target acquisition and quantitative dose measurements. Each cube includes a prostate gland and is machined to receive the dosimeter at the center of the prostate volume.
The Gafchromic film cubes, which contain a 25 cc or 50 cc prostate gland, are designed for film dosimetry in sagittal plan. The design of film prostate cubes is such that the orientation of the radiated film is easily recognized.
|NOTE: The evaluation of 3D dose should be done for a static position since the pelvis body cannot be mounted to
the phantoms actuator which is not MRI safe.|
Advanced Electromechanical Components...
ACTUATOR: (ALSO USED FOR MODEL 008A)
Housed within anodized aluminum enclosures, the actuator contains bipolar stepper motors that enable linear motion accuracy of 0.01 mm and rotational motion accuracy of 0.2°. Linear motion of the target in the (IS) direction can be isolated from rotational motion in the axial plane in both frequency and amplitude. Motions can be synchronized to one another with accuracy better than 20 msec. Motion cycle time accuracy is better than 5 msec. Optical sensors ensure precise mechanical positioning. The actuator is designed for continuous operation. If not manually stopped and reset by the user, it will perform 1000000 (in continuous mode) cycles then stop automatically.
Motions are generated through a three-axis motion controller. A USB port enables interfacing with most computers. The controller box powers the actuator and sends motion instructions through a 25 pin serial cable. The motion controller can be fully operated through CIRS Motion Control Software (see page 3) from a distance of up to 70 feet with the Ethernet/USB cable provided.
DYNAMIC THORAX PHANTOM BODY & SURROGATE PLATFORM.
Model 008A-20 includes the Dynamic Thorax Phantom Body and Surrogate Platform. The Dynamic Thorax Phantom Body is interchanged with the Dynamic Pelvis Body while the Surrogate Platform is attached to the Motion Actuator Box. The Dynamic Thorax Phantom Body represents an average human thorax in shape, proportion and composition. Various lung equivalent rods containing a spherical target or various detectors are available and are inserted into the lung equivalent lobe of the phantom. The body is connected to a motion actuator box that induces three-dimensional target motion through linear translation and rotation of the lung equivalent rod. The CIRS Motion Control Software has been pre-programmed to allow the user to select the phantom that is to be controlled by the software.
Adjustable legs are available. Legs can be useful in leveling the phantom on curved imaging couches.
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